CRYSTALLINE MORPHOLOGY IN A SERIES OF CH_(3)-SUBSTITUTED THERMOTROPIC AROMATIC POLYESTERS WITH EVEN AND ODD FLEXIBLE SPACERS  

作　　者：Shou-xi Chen Zhong-ming Hu Wen-hui Song Yong-ze Jin Ren-yuan Qian 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Center for Molecular Science,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100080,China

出　　处：《Chinese Journal of Polymer Science》2001年第1期71-78,共8页高分子科学(英文版)

基　　金：This work was supported by the National Key Prject of Fundamental Research"Maromolcular Condensed State";Ministy of Scicncc and Technology,China and by Polymer Physics Laboratory,Chinesec Academy of Science.

摘　　要：Crystalline morphology in a series of CH_(3)-substituted main chain thermotropic aromatic polyesters with even and odd numbered methylene spacers has been studied by polarizing optical microscopy(POM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).On crystallization from solution evaporation spherulites of radial structure were observed in the polymers with even numbered spacers,but spherulites with concentric rings form in the polymer with odd numbered spacers.Both spherulites have a lamellar structure,which is about 10 nm in thickness.On crystallization from nematic glassy state spherulites can not be grown;lamellar structure was only observed around disclinations in a specimen during crystallization.Ln the case of crystallization from nematic melt two types of spherulites can be observed far the sample with even numbered spacers.For the sample with add numbered spacers spherulites can not be formed,but only irregular crystallites.

关 键 词：crystalline morphology SPHERULITE even-odd flexible spacers CH_(3)-substituted thermotropic aromatic polyester 

分 类 号：O63[理学—高分子化学]